US865697A - Insulator. - Google Patents

Description

N0.'865,697. PATENTED SEPT. 10, 1907. R. E. HENDERSON & J. N. KING.

INSULATOR. ,APPLIUATION FILED my 16. 1906.

W .k z, a 4 M Noam: PETERS co UNITED STATE S PATENT OFFICE.

ROBERT E. HENDERSON AND JOHN N. KING, OF LOS ANGELES, CALIFORNIA, ASSIGNORS OF ONE-FOURTH TO E. O. WILLIAMS A ND ONE-FOURTH TO JAMES W, KING, OF LOS ANGELES,

CALIFORNIA.

IN SULATOR.

Application filed i To all whom it mu 1 concern:

Be it known that we, ROBERT E. HENDERSON and Jonx N. KING, citizens of the United States, residing at Los Angeles, in the county of Los Angeles and State of California, have invented a new and useful Insulator,

of which the following is a specification.

This invention relates to an insulator particularly intended for use with telephone, telegraph, electric light or other wires, and its main object is to provide for sup- 1 O porting the wire by the engagement of the wire with the insulator in such manner as to dispense with the use of ties or binders.

Another object of the invention is to support the wire in such manner that it will not slack or draw through the insulator to any material extent on breakage'of the wire.

Another object of the invention is to support the wire in such manner as to prevent burning or injury of the wire in its attachment to the insulator.

Another object of the invention is to do away with vibration of the wire due to the working of the wire on the insulator, such as is liable to occur when the wire is .mercly tied to the insulator.

The accompanying drawings illustrate the invention.

Figure 1 is an end elevation of the insulator. Fig. 2 is a side elevation thereof. Fig. 3 is a vertical section on the line 1 in Fig. 1. Fig. 4 is a plan. Fig. 5 is a perspective of the wire, showing the bend it takes when it is secured in the insulator. Fig. 6 is a horizontal section on the line a' a in Fig. 3.

The insulator comprises a body 1 of suitable material, such as glass, having an internal bore 2 which is screw-threaded or otherwise formed to engage with the usual supporting pin and having a petticoat or flange 2 extending below said bore.

A groove 4 is formed in one edge or side of the instilator, the ends of said groove being higher than the middle portion thereof, the groove, for example, being made crescent or are shaped and dipping downwardly 40 toward the center or curving upwardly from the center toward each end. The said groove also inclines up wardly and inwardly, and at each end of the groove the insulator is provided with a seat or depression 5 in the lower face of the groove and a rise or projection 6 in front of said seat. Theupper and lower faces of the groove preferably converge inwardly. The face or side of the insulator in which the groove is formed is preferably more or less flattened, and the portion '7 thereof above the groove extends beyond or overhangs the portion 8 below the groove, as shown, so that when the wire is placed against the lower face 8 and pressed upwardly, it will encounter the downwardly convex end face of the overhanging portion 7 and will thereby be guided into the groove 4. This lower face 8 of the insulator has an upward taper or backward inclination, facilitating this insertion of the wire, and this up- Specification of Letters Patent.

bent around in this groove 10.

latentecl Sept. 10, 1907.

Serial No. 317,217.

ward taper is continued around the lower part of the insulator.

In inserting the wire it is grasped by both hands, one at each side of the insulator, and pressed upwardly, as stated, against the face 8 slipping into the groove, and on further pressure of the wire it is pressed into the groove until it slips or drops into the seats or depressions 5 at the inner termination of the groove at each end thereof. In this operation the wire 12 conforms, or is bent, to the downwardly convex shape of the groove, the wire assuming a curvature such as shown in Fig. 5, and this bond in the wire effectually holds the wire against longitudinal displacement, the wire being cramped or bound within the groove by reason of this bend, and being held from slipping out laterally by the rise or projection 6 in front of the seats 5. In case the wire is of minimum diameter, it will slip to the inner end of the groove throughout, as indicated in dotted lines in Fig. 3, but a larger wire will be pinched or caught between the converging upper and lower faces of the groove before it reaches this innermost position and will assume a position somewhat as shown in Fig. 6 and in full lines in Fig. 3. This will generally be the case with the sizes ordinarily used, and in this case there is in addition to the cramping action, above referred to, a gripping action due to the pinching of the wire in the groove, the seats or wireretaining parts of the insulator being located rearward] y of the plane at the point at which the wire is thus pinched, it follows that the pull of the wire at these seats will continually tend to draw the wire further back into the groove, so that the stronger the pull the tighter the pinch, and in case the wire is broken the downward pull of the wire on the seat also tends to draw the wire further into the groove on account of the upward and inward inclination of the groove. The wire being tightly held it cannot work back and forth, and vibration is thereby prevented.

The insulator is furthermore preferably provided with a groove 10 extending around the same substantially in line with the ends of the groove t, so that in any case where the position of the insulator renders the gripping action of the groove 4 insufficient to hold the wire, a tie-wire may be used, said tie-wire being In practice however, a tie or hinder need very seldom be used. This groove also enables the part 9 of the insulator immediately above the same to serve as a water table, the overhang ing part 7 forming a continuation of this table, and a groove 11 is formed around the insulator above this portion of the insulator to complete the water table.

What we claim is:-

1. An insulator consisting of a body having a curved groove and having a wire-receiving seat at each end of said groove, the top and bottom of said groove converging inwardly.

2. An insulator consisting of a body having a groove in one side thereof, the ends of said groove being higher than the middle portion thereof, and being provided with wire-receiving seats, the top and bottom of said groove converging inwardly.

3. An insulator consisting of a body fiat on one side and rounded on the other sides and having a groove extending into the fiat side thereof, the said groove having a seat at each end and curving from the middle upwardly toward each end, and the upper and lower faces of said groove converging inwardly.

4. An insulator consisting of a body having a groove extending inwardly and upwardly into one side thereof,

the said groove having a seat at each end and curving from the middle upwardly toward each end and the upper and lower faces of said groove converging inwardly, and a groove extending around the insulator in line with the aforesaid groove, the part of the insulator above said groove overhanging the insulator below the groove.

5. An insulator consisting of a body flat on one side and having a groove extending inwardly and upwardly at said flat side, the said groove being curved and rising from the middle toward each end and provided at each end with a wire-receiving seat, the insulator above the said groove projecting to form an overhanging upper face for said groove.

6. An insulator consisting of a body having a groove extending inwardly and upwardly at one side thereof, the said groove being curved and rising from the middle toward each end and provided at each end with a wire receiving seat and the top and bottom of said groove be ing inwardly convergent, the insulator above the said groove projecting to form an overhanging upper face for said groove, and the insulator having a groove extending around same in line with the ends of the said curved groove.

In testimony whereof, we have hereunto set our hand at Los Angeles California this 10th day of May 1906.

ROBERT E. IIENDE KSON. JOHN N. KING.

In presence of An'rritr. I. KNIGHT, LAURA W. Coon.

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